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iostat.c
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/*
* iostat: report CPU and I/O statistics
* (C) 1998-2019 by Sebastien GODARD (sysstat <at> orange.fr)
*
***************************************************************************
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 2 of the License, or (at your *
* option) any later version. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without the implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
* for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA *
***************************************************************************
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
#include <ctype.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include "version.h"
#include "iostat.h"
#include "ioconf.h"
#include "rd_stats.h"
#include "count.h"
#include <locale.h> /* For setlocale() */
#ifdef USE_NLS
#include <libintl.h>
#define _(string) gettext(string)
#else
#define _(string) (string)
#endif
#ifdef USE_SCCSID
#define SCCSID "@(#)sysstat-" VERSION ": " __FILE__ " compiled " __DATE__ " " __TIME__
char *sccsid(void) { return (SCCSID); }
#endif
struct stats_cpu *st_cpu[2];
unsigned long long uptime_cs[2] = {0, 0};
unsigned long long tot_jiffies[2] = {0, 0};
struct io_stats *st_iodev[2];
struct io_hdr_stats *st_hdr_iodev;
struct io_dlist *st_dev_list;
/* Last group name entered on the command line */
char group_name[MAX_NAME_LEN];
/* Number of decimal places */
int dplaces_nr = -1;
int iodev_nr = 0; /* Nb of devices and partitions found. Includes nb of device groups */
int group_nr = 0; /* Nb of device groups */
int cpu_nr = 0; /* Nb of processors on the machine */
int dlist_idx = 0; /* Nb of devices entered on the command line */
int flags = 0; /* Flag for common options and system state */
unsigned int dm_major; /* Device-mapper major number */
long interval = 0;
char timestamp[TIMESTAMP_LEN];
struct sigaction alrm_act;
/*
***************************************************************************
* Print usage and exit.
*
* IN:
* @progname Name of sysstat command.
***************************************************************************
*/
void usage(char *progname)
{
fprintf(stderr, _("Usage: %s [ options ] [ <interval> [ <count> ] ]\n"),
progname);
#ifdef DEBUG
fprintf(stderr, _("Options are:\n"
"[ -c ] [ -d ] [ -h ] [ -k | -m ] [ -N ] [ -s ] [ -t ] [ -V ] [ -x ] [ -y ] [ -z ]\n"
"[ -j { ID | LABEL | PATH | UUID | ... } ]\n"
"[ --dec={ 0 | 1 | 2 } ] [ --human ] [ -o JSON ]\n"
"[ [ -H ] -g <group_name> ] [ -p [ <device> [,...] | ALL ] ]\n"
"[ <device> [...] | ALL ] [ --debuginfo ]\n"));
#else
fprintf(stderr, _("Options are:\n"
"[ -c ] [ -d ] [ -h ] [ -k | -m ] [ -N ] [ -s ] [ -t ] [ -V ] [ -x ] [ -y ] [ -z ]\n"
"[ -j { ID | LABEL | PATH | UUID | ... } ]\n"
"[ --dec={ 0 | 1 | 2 } ] [ --human ] [ -o JSON ]\n"
"[ [ -H ] -g <group_name> ] [ -p [ <device> [,...] | ALL ] ]\n"
"[ <device> [...] | ALL ]\n"));
#endif
exit(1);
}
/*
***************************************************************************
* Set disk output unit. Unit will be kB/s unless POSIXLY_CORRECT
* environment variable has been set, in which case the output will be
* expressed in blocks/s.
***************************************************************************
*/
void set_disk_output_unit(void)
{
if (DISPLAY_KILOBYTES(flags) || DISPLAY_MEGABYTES(flags))
return;
/* Check POSIXLY_CORRECT environment variable */
if (getenv(ENV_POSIXLY_CORRECT) == NULL) {
/* Variable not set: Unit is kB/s and not blocks/s */
flags |= I_D_KILOBYTES;
}
}
/*
***************************************************************************
* SIGALRM signal handler. No need to reset the handler here.
*
* IN:
* @sig Signal number.
***************************************************************************
*/
void alarm_handler(int sig)
{
alarm(interval);
}
/*
***************************************************************************
* Initialize stats common structures.
***************************************************************************
*/
void init_stats(void)
{
int i;
/* Allocate structures for CPUs "all" and 0 */
for (i = 0; i < 2; i++) {
if ((st_cpu[i] = (struct stats_cpu *) malloc(STATS_CPU_SIZE * 2)) == NULL) {
perror("malloc");
exit(4);
}
memset(st_cpu[i], 0, STATS_CPU_SIZE * 2);
}
}
/*
***************************************************************************
* Set every device entry to unregistered status. But don't change status
* for group entries (whose status is DISK_GROUP).
*
* IN:
* @iodev_nr Number of devices and partitions.
* @st_hdr_iodev Pointer on first structure describing a device/partition.
***************************************************************************
*/
void set_entries_unregistered(int iodev_nr, struct io_hdr_stats *st_hdr_iodev)
{
int i;
struct io_hdr_stats *shi = st_hdr_iodev;
for (i = 0; i < iodev_nr; i++, shi++) {
if (shi->status == DISK_REGISTERED) {
shi->status = DISK_UNREGISTERED;
}
}
}
/*
***************************************************************************
* Free unregistered entries (mark them as unused).
*
* IN:
* @iodev_nr Number of devices and partitions.
* @st_hdr_iodev Pointer on first structure describing a device/partition.
***************************************************************************
*/
void free_unregistered_entries(int iodev_nr, struct io_hdr_stats *st_hdr_iodev)
{
int i;
struct io_hdr_stats *shi = st_hdr_iodev;
for (i = 0; i < iodev_nr; i++, shi++) {
if (shi->status == DISK_UNREGISTERED) {
shi->used = FALSE;
}
}
}
/*
***************************************************************************
* Allocate and init I/O device structures.
*
* IN:
* @dev_nr Number of devices and partitions (also including groups
* if option -g has been used).
***************************************************************************
*/
void salloc_device(int dev_nr)
{
int i;
for (i = 0; i < 2; i++) {
if ((st_iodev[i] =
(struct io_stats *) malloc(IO_STATS_SIZE * dev_nr)) == NULL) {
perror("malloc");
exit(4);
}
memset(st_iodev[i], 0, IO_STATS_SIZE * dev_nr);
}
if ((st_hdr_iodev =
(struct io_hdr_stats *) malloc(IO_HDR_STATS_SIZE * dev_nr)) == NULL) {
perror("malloc");
exit(4);
}
memset(st_hdr_iodev, 0, IO_HDR_STATS_SIZE * dev_nr);
}
/*
***************************************************************************
* Allocate structures for devices entered on the command line.
*
* IN:
* @list_len Number of arguments on the command line.
***************************************************************************
*/
void salloc_dev_list(int list_len)
{
if ((st_dev_list = (struct io_dlist *) malloc(IO_DLIST_SIZE * list_len)) == NULL) {
perror("malloc");
exit(4);
}
memset(st_dev_list, 0, IO_DLIST_SIZE * list_len);
}
/*
***************************************************************************
* Free structures used for devices entered on the command line.
***************************************************************************
*/
void sfree_dev_list(void)
{
free(st_dev_list);
}
/*
***************************************************************************
* Look for the device in the device list and store it if not found.
*
* IN:
* @dlist_idx Length of the device list.
* @device_name Name of the device.
*
* OUT:
* @dlist_idx Length of the device list.
*
* RETURNS:
* Position of the device in the list.
***************************************************************************
*/
int update_dev_list(int *dlist_idx, char *device_name)
{
int i;
struct io_dlist *sdli = st_dev_list;
for (i = 0; i < *dlist_idx; i++, sdli++) {
if (!strcmp(sdli->dev_name, device_name))
break;
}
if (i == *dlist_idx) {
/*
* Device not found: Store it.
* Group names will be distinguished from real device names
* thanks to their names which begin with a space.
*/
(*dlist_idx)++;
strncpy(sdli->dev_name, device_name, MAX_NAME_LEN - 1);
}
return i;
}
/*
***************************************************************************
* Allocate and init structures, according to system state.
***************************************************************************
*/
void io_sys_init(void)
{
/* Allocate and init stat common counters */
init_stats();
/* How many processors on this machine? */
cpu_nr = get_cpu_nr(~0, FALSE);
/* Get number of block devices and partitions in /proc/diskstats */
if ((iodev_nr = get_diskstats_dev_nr(CNT_PART, CNT_ALL_DEV)) > 0) {
flags |= I_F_HAS_DISKSTATS;
iodev_nr += NR_DEV_PREALLOC;
}
if (!HAS_DISKSTATS(flags) ||
(DISPLAY_PARTITIONS(flags) && !DISPLAY_PART_ALL(flags))) {
/*
* If /proc/diskstats exists but we also want stats for the partitions
* of a particular device, stats will have to be found in /sys. So we
* need to know if /sys is mounted or not, and set flags accordingly.
*/
/* Get number of block devices (and partitions) in sysfs */
if ((iodev_nr = get_sysfs_dev_nr(DISPLAY_PARTITIONS(flags))) > 0) {
flags |= I_F_HAS_SYSFS;
iodev_nr += NR_DEV_PREALLOC;
}
else {
fprintf(stderr, _("Cannot find disk data\n"));
exit(2);
}
}
/* Also allocate stat structures for "group" devices */
iodev_nr += group_nr;
/*
* Allocate structures for number of disks found, but also
* for groups of devices if option -g has been entered on the command line.
* iodev_nr must be <> 0.
*/
salloc_device(iodev_nr);
}
/*
***************************************************************************
* When group stats are to be displayed (option -g entered on the command
* line), save devices and group names in the io_hdr_stats structures. This
* is normally done later when stats are actually read from /proc or /sys
* files (via a call to save_stats() function), but here we want to make
* sure that the structures are ordered and that each device belongs to its
* proper group.
* Note that we can still have an unexpected device that gets attached to a
* group as devices can be registered or unregistered dynamically.
***************************************************************************
*/
void presave_device_list(void)
{
int i;
struct io_hdr_stats *shi = st_hdr_iodev;
struct io_dlist *sdli = st_dev_list;
if (dlist_idx>0) {
/* First, save the last group name entered on the command line in the list */
update_dev_list(&dlist_idx, group_name);
/* Now save devices and group names in the io_hdr_stats structures */
for (i = 0; (i < dlist_idx) && (i < iodev_nr); i++, shi++, sdli++) {
strncpy(shi->name, sdli->dev_name, MAX_NAME_LEN);
shi->name[MAX_NAME_LEN - 1] = '\0';
shi->used = TRUE;
if (shi->name[0] == ' ') {
/* Current device name is in fact the name of a group */
shi->status = DISK_GROUP;
}
else {
shi->status = DISK_REGISTERED;
}
}
}
else {
/*
* No device names have been entered on the command line but
* the name of a group. Save that name at the end of the
* data table so that all devices that will be read will be
* included in that group.
*/
shi += iodev_nr - 1;
strncpy(shi->name, group_name, MAX_NAME_LEN);
shi->name[MAX_NAME_LEN - 1] = '\0';
shi->used = TRUE;
shi->status = DISK_GROUP;
}
}
/*
***************************************************************************
* Free various structures.
***************************************************************************
*/
void io_sys_free(void)
{
int i;
for (i = 0; i < 2; i++) {
/* Free CPU structures */
free(st_cpu[i]);
/* Free I/O device structures */
free(st_iodev[i]);
}
free(st_hdr_iodev);
}
/*
***************************************************************************
* Save stats for current device or partition.
*
* IN:
* @name Name of the device/partition.
* @curr Index in array for current sample statistics.
* @st_io Structure with device or partition to save.
* @iodev_nr Number of devices and partitions.
* @st_hdr_iodev Pointer on structures describing a device/partition.
*
* OUT:
* @st_hdr_iodev Pointer on structures describing a device/partition.
***************************************************************************
*/
void save_stats(char *name, int curr, void *st_io, int iodev_nr,
struct io_hdr_stats *st_hdr_iodev)
{
int i;
struct io_hdr_stats *st_hdr_iodev_i;
struct io_stats *st_iodev_i;
/* Look for device in data table */
for (i = 0; i < iodev_nr; i++) {
st_hdr_iodev_i = st_hdr_iodev + i;
if (!strcmp(st_hdr_iodev_i->name, name)) {
break;
}
}
if (i == iodev_nr) {
/*
* This is a new device: Look for an unused entry to store it.
* Thus we are able to handle dynamically registered devices.
*/
for (i = 0; i < iodev_nr; i++) {
st_hdr_iodev_i = st_hdr_iodev + i;
if (!st_hdr_iodev_i->used) {
/* Unused entry found... */
st_hdr_iodev_i->used = TRUE; /* Indicate it is now used */
strncpy(st_hdr_iodev_i->name, name, MAX_NAME_LEN - 1);
st_hdr_iodev_i->name[MAX_NAME_LEN - 1] = '\0';
st_iodev_i = st_iodev[!curr] + i;
memset(st_iodev_i, 0, IO_STATS_SIZE);
break;
}
}
}
if (i < iodev_nr) {
st_hdr_iodev_i = st_hdr_iodev + i;
if (st_hdr_iodev_i->status == DISK_UNREGISTERED) {
st_hdr_iodev_i->status = DISK_REGISTERED;
if (st_hdr_iodev_i->used == FALSE) {
st_iodev_i = st_iodev[!curr] + i;
memset(st_iodev_i, 0, IO_STATS_SIZE);
st_hdr_iodev_i->used = TRUE;
}
}
st_iodev_i = st_iodev[curr] + i;
*st_iodev_i = *((struct io_stats *) st_io);
}
/*
* else it was a new device
* but there was no free structure to store it.
*/
}
/*
***************************************************************************
* Read sysfs stat for current block device or partition.
*
* IN:
* @curr Index in array for current sample statistics.
* @filename File name where stats will be read.
* @dev_name Device or partition name.
*
* RETURNS:
* 0 if file couldn't be opened, 1 otherwise.
***************************************************************************
*/
int read_sysfs_file_stat(int curr, char *filename, char *dev_name)
{
FILE *fp;
struct io_stats sdev;
int i;
unsigned int ios_pgr, tot_ticks, rq_ticks, wr_ticks;
unsigned long rd_ios, rd_merges_or_rd_sec, wr_ios, wr_merges;
unsigned long rd_sec_or_wr_ios, wr_sec, rd_ticks_or_wr_sec;
unsigned long dc_ios, dc_merges, dc_sec, dc_ticks;
/* Try to read given stat file */
if ((fp = fopen(filename, "r")) == NULL)
return 0;
i = fscanf(fp, "%lu %lu %lu %lu %lu %lu %lu %u %u %u %u %lu %lu %lu %lu",
&rd_ios, &rd_merges_or_rd_sec, &rd_sec_or_wr_ios, &rd_ticks_or_wr_sec,
&wr_ios, &wr_merges, &wr_sec, &wr_ticks, &ios_pgr, &tot_ticks, &rq_ticks,
&dc_ios, &dc_merges, &dc_sec, &dc_ticks);
memset(&sdev, 0, sizeof(struct io_stats));
if (i >= 11) {
/* Device or partition */
sdev.rd_ios = rd_ios;
sdev.rd_merges = rd_merges_or_rd_sec;
sdev.rd_sectors = rd_sec_or_wr_ios;
sdev.rd_ticks = (unsigned int) rd_ticks_or_wr_sec;
sdev.wr_ios = wr_ios;
sdev.wr_merges = wr_merges;
sdev.wr_sectors = wr_sec;
sdev.wr_ticks = wr_ticks;
sdev.ios_pgr = ios_pgr;
sdev.tot_ticks = tot_ticks;
sdev.rq_ticks = rq_ticks;
if (i == 15) {
/* Discard I/O */
sdev.dc_ios = dc_ios;
sdev.dc_merges = dc_merges;
sdev.dc_sectors = dc_sec;
sdev.dc_ticks = dc_ticks;
}
}
else if (i == 4) {
/* Partition without extended statistics */
sdev.rd_ios = rd_ios;
sdev.rd_sectors = rd_merges_or_rd_sec;
sdev.wr_ios = rd_sec_or_wr_ios;
sdev.wr_sectors = rd_ticks_or_wr_sec;
}
if ((i >= 11) || !DISPLAY_EXTENDED(flags)) {
/*
* In fact, we _don't_ save stats if it's a partition without
* extended stats and yet we want to display ext stats.
*/
save_stats(dev_name, curr, &sdev, iodev_nr, st_hdr_iodev);
}
fclose(fp);
return 1;
}
/*
***************************************************************************
* Read sysfs stats for all the partitions of a device.
*
* IN:
* @curr Index in array for current sample statistics.
* @dev_name Device name.
***************************************************************************
*/
void read_sysfs_dlist_part_stat(int curr, char *dev_name)
{
DIR *dir;
struct dirent *drd;
char dfile[MAX_PF_NAME], filename[MAX_PF_NAME + 512];
snprintf(dfile, sizeof(dfile), "%s/%s", SYSFS_BLOCK, dev_name);
dfile[sizeof(dfile) - 1] = '\0';
/* Open current device directory in /sys/block */
if ((dir = opendir(dfile)) == NULL)
return;
/* Get current entry */
while ((drd = readdir(dir)) != NULL) {
if (!strcmp(drd->d_name, ".") || !strcmp(drd->d_name, ".."))
continue;
snprintf(filename, sizeof(filename), "%s/%s/%s", dfile, drd->d_name, S_STAT);
filename[sizeof(filename) - 1] = '\0';
/* Read current partition stats */
read_sysfs_file_stat(curr, filename, drd->d_name);
}
/* Close device directory */
closedir(dir);
}
/*
***************************************************************************
* Read stats from the sysfs filesystem for the devices entered on the
* command line.
*
* IN:
* @curr Index in array for current sample statistics.
***************************************************************************
*/
void read_sysfs_dlist_stat(int curr)
{
int dev, ok;
char filename[MAX_PF_NAME];
char *slash;
struct io_dlist *st_dev_list_i;
/* Every I/O device (or partition) is potentially unregistered */
set_entries_unregistered(iodev_nr, st_hdr_iodev);
for (dev = 0; dev < dlist_idx; dev++) {
st_dev_list_i = st_dev_list + dev;
/* Some devices may have a slash in their name (eg. cciss/c0d0...) */
while ((slash = strchr(st_dev_list_i->dev_name, '/'))) {
*slash = '!';
}
snprintf(filename, MAX_PF_NAME, "%s/%s/%s",
SYSFS_BLOCK, st_dev_list_i->dev_name, S_STAT);
filename[MAX_PF_NAME - 1] = '\0';
/* Read device stats */
ok = read_sysfs_file_stat(curr, filename, st_dev_list_i->dev_name);
if (ok && st_dev_list_i->disp_part) {
/* Also read stats for its partitions */
read_sysfs_dlist_part_stat(curr, st_dev_list_i->dev_name);
}
}
/* Free structures corresponding to unregistered devices */
free_unregistered_entries(iodev_nr, st_hdr_iodev);
}
/*
***************************************************************************
* Read stats from the sysfs filesystem for every block devices found.
*
* IN:
* @curr Index in array for current sample statistics.
***************************************************************************
*/
void read_sysfs_stat(int curr)
{
DIR *dir;
struct dirent *drd;
char filename[MAX_PF_NAME];
int ok;
/* Every I/O device entry is potentially unregistered */
set_entries_unregistered(iodev_nr, st_hdr_iodev);
/* Open /sys/block directory */
if ((dir = opendir(SYSFS_BLOCK)) != NULL) {
/* Get current entry */
while ((drd = readdir(dir)) != NULL) {
if (!strcmp(drd->d_name, ".") || !strcmp(drd->d_name, ".."))
continue;
snprintf(filename, MAX_PF_NAME, "%s/%s/%s",
SYSFS_BLOCK, drd->d_name, S_STAT);
filename[MAX_PF_NAME - 1] = '\0';
/* If current entry is a directory, try to read its stat file */
ok = read_sysfs_file_stat(curr, filename, drd->d_name);
/*
* If '-p ALL' was entered on the command line,
* also try to read stats for its partitions
*/
if (ok && DISPLAY_PART_ALL(flags)) {
read_sysfs_dlist_part_stat(curr, drd->d_name);
}
}
/* Close /sys/block directory */
closedir(dir);
}
/* Free structures corresponding to unregistered devices */
free_unregistered_entries(iodev_nr, st_hdr_iodev);
}
/*
***************************************************************************
* Read stats from /proc/diskstats.
*
* IN:
* @curr Index in array for current sample statistics.
***************************************************************************
*/
void read_diskstats_stat(int curr)
{
FILE *fp;
char line[256], dev_name[MAX_NAME_LEN];
char *dm_name;
struct io_stats sdev;
int i;
unsigned int ios_pgr, tot_ticks, rq_ticks, wr_ticks;
unsigned long rd_ios, rd_merges_or_rd_sec, rd_ticks_or_wr_sec, wr_ios;
unsigned long wr_merges, rd_sec_or_wr_ios, wr_sec;
unsigned long dc_ios, dc_merges, dc_sec, dc_ticks;
char *ioc_dname;
unsigned int major, minor;
memset(&sdev, 0, sizeof(struct io_stats));
/* Every I/O device entry is potentially unregistered */
set_entries_unregistered(iodev_nr, st_hdr_iodev);
if ((fp = fopen(DISKSTATS, "r")) == NULL)
return;
while (fgets(line, sizeof(line), fp) != NULL) {
/* major minor name rio rmerge rsect ruse wio wmerge wsect wuse running use aveq dcio dcmerge dcsect dcuse*/
i = sscanf(line, "%u %u %s %lu %lu %lu %lu %lu %lu %lu %u %u %u %u %lu %lu %lu %lu",
&major, &minor, dev_name,
&rd_ios, &rd_merges_or_rd_sec, &rd_sec_or_wr_ios, &rd_ticks_or_wr_sec,
&wr_ios, &wr_merges, &wr_sec, &wr_ticks, &ios_pgr, &tot_ticks, &rq_ticks,
&dc_ios, &dc_merges, &dc_sec, &dc_ticks);
if (i >= 14) {
/* Device or partition */
if (!dlist_idx && !DISPLAY_PARTITIONS(flags) &&
!is_device(dev_name, ACCEPT_VIRTUAL_DEVICES))
continue;
sdev.rd_ios = rd_ios;
sdev.rd_merges = rd_merges_or_rd_sec;
sdev.rd_sectors = rd_sec_or_wr_ios;
sdev.rd_ticks = (unsigned int) rd_ticks_or_wr_sec;
sdev.wr_ios = wr_ios;
sdev.wr_merges = wr_merges;
sdev.wr_sectors = wr_sec;
sdev.wr_ticks = wr_ticks;
sdev.ios_pgr = ios_pgr;
sdev.tot_ticks = tot_ticks;
sdev.rq_ticks = rq_ticks;
if (i == 18) {
/* Discard I/O */
sdev.dc_ios = dc_ios;
sdev.dc_merges = dc_merges;
sdev.dc_sectors = dc_sec;
sdev.dc_ticks = dc_ticks;
}
}
else if (i == 7) {
/* Partition without extended statistics */
if (DISPLAY_EXTENDED(flags) ||
(!dlist_idx && !DISPLAY_PARTITIONS(flags)))
continue;
sdev.rd_ios = rd_ios;
sdev.rd_sectors = rd_merges_or_rd_sec;
sdev.wr_ios = rd_sec_or_wr_ios;
sdev.wr_sectors = rd_ticks_or_wr_sec;
}
else
/* Unknown entry: Ignore it */
continue;
if ((ioc_dname = ioc_name(major, minor)) != NULL) {
if (strcmp(dev_name, ioc_dname) && strcmp(ioc_dname, K_NODEV)) {
/*
* No match: Use name generated from sysstat.ioconf data
* (if different from "nodev") works around known issues
* with EMC PowerPath.
*/
strncpy(dev_name, ioc_dname, MAX_NAME_LEN - 1);
dev_name[MAX_NAME_LEN - 1] = '\0';
}
}
if ((DISPLAY_DEVMAP_NAME(flags)) && (major == dm_major)) {
/*
* If the device is a device mapper device, try to get its
* assigned name of its logical device.
*/
dm_name = transform_devmapname(major, minor);
if (dm_name) {
strncpy(dev_name, dm_name, MAX_NAME_LEN - 1);
dev_name[MAX_NAME_LEN - 1] = '\0';
}
}
save_stats(dev_name, curr, &sdev, iodev_nr, st_hdr_iodev);
}
fclose(fp);
/* Free structures corresponding to unregistered devices */
free_unregistered_entries(iodev_nr, st_hdr_iodev);
}
/*
***************************************************************************
* Compute stats for device groups using stats of every device belonging
* to each of these groups.
*
* IN:
* @curr Index in array for current sample statistics.
***************************************************************************
*/
void compute_device_groups_stats(int curr)
{
struct io_stats gdev, *ioi;
struct io_hdr_stats *shi = st_hdr_iodev;
int i, nr_disks;
memset(&gdev, 0, IO_STATS_SIZE);
nr_disks = 0;
for (i = 0; i < iodev_nr; i++, shi++) {
if (shi->used && (shi->status == DISK_REGISTERED)) {
ioi = st_iodev[curr] + i;
if (!DISPLAY_UNFILTERED(flags)) {
if (!ioi->rd_ios && !ioi->wr_ios && !ioi->dc_ios)
continue;
}
gdev.rd_ios += ioi->rd_ios;
gdev.rd_merges += ioi->rd_merges;
gdev.rd_sectors += ioi->rd_sectors;
gdev.rd_ticks += ioi->rd_ticks;
gdev.wr_ios += ioi->wr_ios;
gdev.wr_merges += ioi->wr_merges;
gdev.wr_sectors += ioi->wr_sectors;
gdev.wr_ticks += ioi->wr_ticks;
gdev.dc_ios += ioi->dc_ios;
gdev.dc_merges += ioi->dc_merges;
gdev.dc_sectors += ioi->dc_sectors;
gdev.dc_ticks += ioi->dc_ticks;
gdev.ios_pgr += ioi->ios_pgr;
gdev.tot_ticks += ioi->tot_ticks;
gdev.rq_ticks += ioi->rq_ticks;
nr_disks++;
}
else if (shi->status == DISK_GROUP) {
save_stats(shi->name, curr, &gdev, iodev_nr, st_hdr_iodev);
shi->used = nr_disks;
nr_disks = 0;
memset(&gdev, 0, IO_STATS_SIZE);
}
}
}
/*
***************************************************************************
* Write current sample's timestamp, either in plain or JSON format.
*
* IN:
* @tab Number of tabs to print.
* @rectime Current date and time.
***************************************************************************
*/
void write_sample_timestamp(int tab, struct tm *rectime)
{
if (DISPLAY_ISO(flags)) {
strftime(timestamp, sizeof(timestamp), "%FT%T%z", rectime);
}
else {
strftime(timestamp, sizeof(timestamp), "%x %X", rectime);
}
if (DISPLAY_JSON_OUTPUT(flags)) {
xprintf(tab, "\"timestamp\": \"%s\",", timestamp);
}
else {
printf("%s\n", timestamp);
}
}
/*
***************************************************************************
* Display CPU utilization in plain format.
*
* IN:
* @curr Index in array for current sample statistics.
* @deltot_jiffies
* Number of jiffies spent on the interval by all processors.
***************************************************************************
*/
void write_plain_cpu_stat(int curr, unsigned long long deltot_jiffies)
{
printf("avg-cpu: %%user %%nice %%system %%iowait %%steal %%idle\n");
printf(" ");
cprintf_pc(DISPLAY_UNIT(flags), 6, 7, 2,
ll_sp_value(st_cpu[!curr]->cpu_user, st_cpu[curr]->cpu_user, deltot_jiffies),
ll_sp_value(st_cpu[!curr]->cpu_nice, st_cpu[curr]->cpu_nice, deltot_jiffies),
/*
* Time spent in system mode also includes time spent servicing
* hard and soft interrupts.
*/
ll_sp_value(st_cpu[!curr]->cpu_sys + st_cpu[!curr]->cpu_softirq +
st_cpu[!curr]->cpu_hardirq,
st_cpu[curr]->cpu_sys + st_cpu[curr]->cpu_softirq +
st_cpu[curr]->cpu_hardirq, deltot_jiffies),
ll_sp_value(st_cpu[!curr]->cpu_iowait, st_cpu[curr]->cpu_iowait, deltot_jiffies),
ll_sp_value(st_cpu[!curr]->cpu_steal, st_cpu[curr]->cpu_steal, deltot_jiffies),
(st_cpu[curr]->cpu_idle < st_cpu[!curr]->cpu_idle) ?
0.0 :
ll_sp_value(st_cpu[!curr]->cpu_idle, st_cpu[curr]->cpu_idle, deltot_jiffies));
printf("\n\n");
}
/*
***************************************************************************
* Display CPU utilization in JSON format.
*
* IN:
* @tab Number of tabs to print.
* @curr Index in array for current sample statistics.
* @deltot_jiffies
* Number of jiffies spent on the interval by all processors.
***************************************************************************
*/
void write_json_cpu_stat(int tab, int curr, unsigned long long deltot_jiffies)
{
xprintf0(tab, "\"avg-cpu\": {\"user\": %.2f, \"nice\": %.2f, \"system\": %.2f,"
" \"iowait\": %.2f, \"steal\": %.2f, \"idle\": %.2f}",
ll_sp_value(st_cpu[!curr]->cpu_user, st_cpu[curr]->cpu_user, deltot_jiffies),
ll_sp_value(st_cpu[!curr]->cpu_nice, st_cpu[curr]->cpu_nice, deltot_jiffies),
/*
* Time spent in system mode also includes time spent servicing
* hard and soft interrupts.
*/
ll_sp_value(st_cpu[!curr]->cpu_sys + st_cpu[!curr]->cpu_softirq +
st_cpu[!curr]->cpu_hardirq,
st_cpu[curr]->cpu_sys + st_cpu[curr]->cpu_softirq +
st_cpu[curr]->cpu_hardirq, deltot_jiffies),
ll_sp_value(st_cpu[!curr]->cpu_iowait, st_cpu[curr]->cpu_iowait, deltot_jiffies),
ll_sp_value(st_cpu[!curr]->cpu_steal, st_cpu[curr]->cpu_steal, deltot_jiffies),
(st_cpu[curr]->cpu_idle < st_cpu[!curr]->cpu_idle) ?
0.0 :
ll_sp_value(st_cpu[!curr]->cpu_idle, st_cpu[curr]->cpu_idle, deltot_jiffies));
}
/*
***************************************************************************
* Display CPU utilization in plain or JSON format.
*
* IN:
* @curr Index in array for current sample statistics.
* @tab Number of tabs to print (JSON format only).
***************************************************************************
*/
void write_cpu_stat(int curr, int tab)
{
unsigned long long deltot_jiffies;
/*
* Compute the total number of jiffies spent by all processors.
* NB: Don't add cpu_guest/cpu_guest_nice because cpu_user/cpu_nice
* already include them.
*/
tot_jiffies[curr] = st_cpu[curr]->cpu_user + st_cpu[curr]->cpu_nice +
st_cpu[curr]->cpu_sys + st_cpu[curr]->cpu_idle +
st_cpu[curr]->cpu_iowait + st_cpu[curr]->cpu_hardirq +
st_cpu[curr]->cpu_steal + st_cpu[curr]->cpu_softirq;
/* Total number of jiffies spent on the interval */
deltot_jiffies = get_interval(tot_jiffies[!curr], tot_jiffies[curr]);
#ifdef DEBUG
if (DISPLAY_DEBUG(flags)) {
/* Debug output */
fprintf(stderr, "deltot_jiffies=%llu st_cpu[curr]{ cpu_user=%llu cpu_nice=%llu "
"cpu_sys=%llu cpu_idle=%llu cpu_iowait=%llu cpu_steal=%llu "
"cpu_hardirq=%llu cpu_softirq=%llu cpu_guest=%llu "
"cpu_guest_nice=%llu }\n",
deltot_jiffies,
st_cpu[curr]->cpu_user,
st_cpu[curr]->cpu_nice,
st_cpu[curr]->cpu_sys,
st_cpu[curr]->cpu_idle,
st_cpu[curr]->cpu_iowait,
st_cpu[curr]->cpu_steal,
st_cpu[curr]->cpu_hardirq,
st_cpu[curr]->cpu_softirq,
st_cpu[curr]->cpu_guest,
st_cpu[curr]->cpu_guest_nice);
}
#endif
if (DISPLAY_JSON_OUTPUT(flags)) {
write_json_cpu_stat(tab, curr, deltot_jiffies);
}
else {
write_plain_cpu_stat(curr, deltot_jiffies);
}